MCTuomey
Veteran
Not exactly. First, it's slow to lock focus...you'll hear the motor whirring away and it'll give up and show a red square (indicating focus has not been locked). So then you'll have to half-press to try again. It'll often lock on a second attempt. Second thing is that you have to be fairly careful about what the focus point is on. When light is low, it'll just lock in on the highest contrast thing that's closest to the focus point. I use single-point AF, not zone or multi, so I don't know if those other modes result in the the focus point jumping around (I suspect it would).
Note that all these comments apply mainly to the X-Pro1. It's better on the XT-1 ....
This problem isn't restricted to low light shooting, although that's where it surfaces most for me. Problem is outlined by *eujin* above: poor focus lock performance where highlights, broad or specular, are adjacent to the desired point of a normal/lower contrast subject. True for my XT1 fw 4.0 cameras, across all my XF lenses, primes or zooms. I have tried reducing/enlarging the focus point size, multi-point selection, semi-frantic focus & recompose, continuous AF - nothing really helps other than changing the shooting perspective to reduce the background highlights in the frame.
Shooting into the light with my Fujis is frustrating, and shouldn't be.
I've had same issue once in awhile with my Canon dSLR gear, but much less frequently.